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Finding the Fourth Proportional to 578.84, 868.80 and 458.42

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Solution

The fourth proportional to 578.84, 868.80 and 458.42 is: 688.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    578.84 : 868.80 = 458.42 : x
  2. Step 2: Convert to fraction form
    578.84/868.80 = 458.42/x
  3. Step 3: Cross multiply
    578.84x = 868.80 × 458.42
  4. Step 4: Simplify right side
    578.84x = 398,275.30
  5. Step 5: Solve for x
    x = 398,275.30/578.84
  6. Step 6: Final answer
    x = 688.06

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.